Centering rule



FIG. 1 is a perspective view of a centering rule showing my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof, the other side being identical; and,

FIG. 5 is a front end elevational view thereof, the rear end being identical. 

The ornamental design for a centering rule, as shown and described. 